[PATCH 15/27] HID: wacom: EKR: have the wacom resources dynamically allocated

Benjamin Tissoires
2016-07-05T14:44:33Z

If we want to have one input device per remote, it's better to have our
own struct wacom_remote which is dynamically allocated.

Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
---
drivers/hid/wacom.h | 13 +++--
drivers/hid/wacom_sys.c | 133 ++++++++++++++++++++++++++++--------------------
drivers/hid/wacom_wac.c | 10 ++--
drivers/hid/wacom_wac.h | 2 +-
4 files changed, 93 insertions(+), 65 deletions(-)

diff --git a/drivers/hid/wacom.h b/drivers/hid/wacom.h
index 1797e4b..110ea67 100644
--- a/drivers/hid/wacom.h
+++ b/drivers/hid/wacom.h
@@ -116,6 +116,14 @@ struct wacom_group_leds {
u8 select; /* status led selector (0..3) */
};

+struct wacom_remote {
+ spinlock_t remote_lock;
+ struct kfifo remote_fifo;
+ struct kobject *remote_dir;
+ struct attribute_group remote_group[WACOM_MAX_REMOTES];
+ __u32 serial[WACOM_MAX_REMOTES];
+};
+
struct wacom {
struct usb_device *usbdev;
struct usb_interface *intf;
@@ -125,8 +133,7 @@ struct wacom {
struct work_struct wireless_work;
struct work_struct battery_work;
struct work_struct remote_work;
- spinlock_t remote_lock;
- struct kfifo remote_fifo;
+ struct wacom_remote *remote;
struct wacom_leds {
struct wacom_group_leds *groups;
u8 llv; /* status led brightness no button (1..127) */
@@ -137,8 +144,6 @@ struct wacom {
struct power_supply *ac;
struct power_supply_desc battery_desc;
struct power_supply_desc ac_desc;
- struct kobject *remote_dir;
- struct attribute_group remote_group[5];
bool resources;
};

diff --git a/drivers/hid/wacom_sys.c b/drivers/hid/wacom_sys.c
index 7e01117..64acb71 100644
--- a/drivers/hid/wacom_sys.c
+++ b/drivers/hid/wacom_sys.c
@@ -1298,18 +1298,18 @@ static int wacom_remote_create_attr_group(struct wacom *wacom, __u32 serial,
int index)
{
int error = 0;
- struct wacom_wac *wacom_wac = &wacom->wacom_wac;
+ struct wacom_remote *remote = wacom->remote;

- wacom_wac->serial[index] = serial;
+ remote->serial[index] = serial;

- wacom->remote_group[index].name = devm_kasprintf(&wacom->hdev->dev,
- GFP_KERNEL,
- "%d", serial);
- if (!wacom->remote_group[index].name)
+ remote->remote_group[index].name = devm_kasprintf(&wacom->hdev->dev,
+ GFP_KERNEL,
+ "%d", serial);
+ if (!remote->remote_group[index].name)
return -ENOMEM;

- error = sysfs_create_group(wacom->remote_dir,
- &wacom->remote_group[index]);
+ error = sysfs_create_group(remote->remote_dir,
+ &remote->remote_group[index]);
if (error) {
hid_err(wacom->hdev,
"cannot create sysfs group err: %d\n", error);
@@ -1321,22 +1321,22 @@ static int wacom_remote_create_attr_group(struct wacom *wacom, __u32 serial,

static void wacom_remote_destroy_attr_group(struct wacom *wacom, __u32 serial)
{
- struct wacom_wac *wacom_wac = &wacom->wacom_wac;
+ struct wacom_remote *remote = wacom->remote;
int i;

if (!serial)
return;

for (i = 0; i < WACOM_MAX_REMOTES; i++) {
- if (wacom_wac->serial[i] == serial) {
- wacom_wac->serial[i] = 0;
+ if (remote->serial[i] == serial) {
+ remote->serial[i] = 0;
wacom->led.groups[i].select = WACOM_STATUS_UNKNOWN;
- if (wacom->remote_group[i].name) {
- sysfs_remove_group(wacom->remote_dir,
- &wacom->remote_group[i]);
+ if (remote->remote_group[i].name) {
+ sysfs_remove_group(remote->remote_dir,
+ &remote->remote_group[i]);
devm_kfree(&wacom->hdev->dev,
- (char *)wacom->remote_group[i].name);
- wacom->remote_group[i].name = NULL;
+ (char *)remote->remote_group[i].name);
+ remote->remote_group[i].name = NULL;
}
}
}
@@ -1398,27 +1398,57 @@ static const struct attribute *remote_unpair_attrs[] = {
NULL
};

-static int wacom_initialize_remote(struct wacom *wacom)
+static void wacom_remotes_destroy(void *data)
+{
+ struct wacom *wacom = data;
+ struct wacom_remote *remote = wacom->remote;
+
+ if (!remote)
+ return;
+
+ kobject_put(remote->remote_dir);
+ kfifo_free(&remote->remote_fifo);
+ wacom->remote = NULL;
+}
+
+static int wacom_initialize_remotes(struct wacom *wacom)
{
int error = 0;
- struct wacom_wac *wacom_wac = &(wacom->wacom_wac);
+ struct wacom_remote *remote;
int i;

if (wacom->wacom_wac.features.type != REMOTE)
return 0;

- wacom->remote_group[0] = remote0_serial_group;
- wacom->remote_group[1] = remote1_serial_group;
- wacom->remote_group[2] = remote2_serial_group;
- wacom->remote_group[3] = remote3_serial_group;
- wacom->remote_group[4] = remote4_serial_group;
+ remote = devm_kzalloc(&wacom->hdev->dev, sizeof(*wacom->remote),
+ GFP_KERNEL);
+ if (!remote)
+ return -ENOMEM;

- wacom->remote_dir = kobject_create_and_add("wacom_remote",
- &wacom->hdev->dev.kobj);
- if (!wacom->remote_dir)
+ wacom->remote = remote;
+
+ spin_lock_init(&remote->remote_lock);
+
+ error = kfifo_alloc(&remote->remote_fifo,
+ 5 * sizeof(struct wacom_remote_data),
+ GFP_KERNEL);
+ if (error) {
+ hid_err(wacom->hdev, "failed allocating remote_fifo\n");
return -ENOMEM;
+ }

- error = sysfs_create_files(wacom->remote_dir, remote_unpair_attrs);
+ remote->remote_group[0] = remote0_serial_group;
+ remote->remote_group[1] = remote1_serial_group;
+ remote->remote_group[2] = remote2_serial_group;
+ remote->remote_group[3] = remote3_serial_group;
+ remote->remote_group[4] = remote4_serial_group;
+
+ remote->remote_dir = kobject_create_and_add("wacom_remote",
+ &wacom->hdev->dev.kobj);
+ if (!remote->remote_dir)
+ return -ENOMEM;
+
+ error = sysfs_create_files(remote->remote_dir, remote_unpair_attrs);

if (error) {
hid_err(wacom->hdev,
@@ -1428,9 +1458,14 @@ static int wacom_initialize_remote(struct wacom *wacom)

for (i = 0; i < WACOM_MAX_REMOTES; i++) {
wacom->led.groups[i].select = WACOM_STATUS_UNKNOWN;
- wacom_wac->serial[i] = 0;
+ remote->serial[i] = 0;
}

+ error = devm_add_action_or_reset(&wacom->hdev->dev,
+ wacom_remotes_destroy, wacom);
+ if (error)
+ return error;
+
return 0;
}

@@ -1740,7 +1775,7 @@ static int wacom_parse_and_register(struct wacom *wacom, bool wireless)
if (error)
goto fail_leds;

- error = wacom_initialize_remote(wacom);
+ error = wacom_initialize_remotes(wacom);
if (error)
goto fail_remote;
}
@@ -1792,7 +1827,6 @@ static int wacom_parse_and_register(struct wacom *wacom, bool wireless)
fail_quirks:
hid_hw_stop(hdev);
fail_hw_start:
- kobject_put(wacom->remote_dir);
fail_remote:
fail_leds:
fail_register_inputs:
@@ -1893,58 +1927,58 @@ fail:
static void wacom_remote_work(struct work_struct *work)
{
struct wacom *wacom = container_of(work, struct wacom, remote_work);
- struct wacom_wac *wacom_wac = &wacom->wacom_wac;
+ struct wacom_remote *remote = wacom->remote;
struct wacom_remote_data data;
unsigned long flags;
unsigned int count;
u32 serial;
int i, k;

- spin_lock_irqsave(&wacom->remote_lock, flags);
+ spin_lock_irqsave(&remote->remote_lock, flags);

- count = kfifo_out(&wacom->remote_fifo, &data, sizeof(data));
+ count = kfifo_out(&remote->remote_fifo, &data, sizeof(data));

if (count != sizeof(data)) {
hid_err(wacom->hdev,
"workitem triggered without status available\n");
- spin_unlock_irqrestore(&wacom->remote_lock, flags);
+ spin_unlock_irqrestore(&remote->remote_lock, flags);
return;
}

- if (!kfifo_is_empty(&wacom->remote_fifo))
+ if (!kfifo_is_empty(&remote->remote_fifo))
wacom_schedule_work(&wacom->wacom_wac, WACOM_WORKER_REMOTE);

- spin_unlock_irqrestore(&wacom->remote_lock, flags);
+ spin_unlock_irqrestore(&remote->remote_lock, flags);

for (i = 0; i < WACOM_MAX_REMOTES; i++) {
serial = data.remote[i].serial;
if (data.remote[i].connected) {

- if (wacom_wac->serial[i] == serial)
+ if (remote->serial[i] == serial)
continue;

- if (wacom_wac->serial[i]) {
+ if (remote->serial[i]) {
wacom_remote_destroy_attr_group(wacom,
- wacom_wac->serial[i]);
+ remote->serial[i]);
}

/* A remote can pair more than once with an EKR,
* check to make sure this serial isn't already paired.
*/
for (k = 0; k < WACOM_MAX_REMOTES; k++) {
- if (wacom_wac->serial[k] == serial)
+ if (remote->serial[k] == serial)
break;
}

if (k < WACOM_MAX_REMOTES) {
- wacom_wac->serial[i] = serial;
+ remote->serial[i] = serial;
continue;
}
wacom_remote_create_attr_group(wacom, serial, i);

- } else if (wacom_wac->serial[i]) {
+ } else if (remote->serial[i]) {
wacom_remote_destroy_attr_group(wacom,
- wacom_wac->serial[i]);
+ remote->serial[i]);
}
}
}
@@ -1992,16 +2026,6 @@ static int wacom_probe(struct hid_device *hdev,
INIT_WORK(&wacom->wireless_work, wacom_wireless_work);
INIT_WORK(&wacom->battery_work, wacom_battery_work);
INIT_WORK(&wacom->remote_work, wacom_remote_work);
- spin_lock_init(&wacom->remote_lock);
-
- if (kfifo_alloc(&wacom->remote_fifo,
- 5 * sizeof(struct wacom_remote_data),
- GFP_KERNEL)) {
- dev_err(&hdev->dev,
- "%s:failed allocating remote_fifo\n", __func__);
- error = -ENOMEM;
- goto fail_type;
- }

/* ask for the report descriptor to be loaded by HID */
error = hid_parse(hdev);
@@ -2025,7 +2049,6 @@ static int wacom_probe(struct hid_device *hdev,
return 0;

fail_parse:
- kfifo_free(&wacom->remote_fifo);
fail_type:
hid_set_drvdata(hdev, NULL);
return error;
@@ -2045,8 +2068,6 @@ static void wacom_remove(struct hid_device *hdev)
cancel_work_sync(&wacom->wireless_work);
cancel_work_sync(&wacom->battery_work);
cancel_work_sync(&wacom->remote_work);
- kfifo_free(&wacom->remote_fifo);
- kobject_put(wacom->remote_dir);
if (hdev->bus == BUS_BLUETOOTH)
device_remove_file(&hdev->dev, &dev_attr_speed);

diff --git a/drivers/hid/wacom_wac.c b/drivers/hid/wacom_wac.c
index 4f4a2b9..d5c180d 100644
--- a/drivers/hid/wacom_wac.c
+++ b/drivers/hid/wacom_wac.c
@@ -753,6 +753,7 @@ static int wacom_remote_irq(struct wacom_wac *wacom_wac, size_t len)
unsigned char *data = wacom_wac->data;
struct input_dev *input = wacom_wac->pad_input;
struct wacom *wacom = container_of(wacom_wac, struct wacom, wacom_wac);
+ struct wacom_remote *remote = wacom->remote;
struct wacom_features *features = &wacom_wac->features;
int bat_charging, bat_percent, touch_ring_mode;
__u32 serial;
@@ -807,7 +808,7 @@ static int wacom_remote_irq(struct wacom_wac *wacom_wac, size_t len)
touch_ring_mode = (data[11] & 0xC0) >> 6;

for (i = 0; i < WACOM_MAX_REMOTES; i++) {
- if (wacom_wac->serial[i] == serial)
+ if (remote->serial[i] == serial)
wacom->led.groups[i].select = touch_ring_mode;
}

@@ -827,6 +828,7 @@ static int wacom_remote_status_irq(struct wacom_wac *wacom_wac, size_t len)
{
struct wacom *wacom = container_of(wacom_wac, struct wacom, wacom_wac);
unsigned char *data = wacom_wac->data;
+ struct wacom_remote *remote = wacom->remote;
struct wacom_remote_data remote_data = {0};
unsigned long flags;
int i, ret;
@@ -843,15 +845,15 @@ static int wacom_remote_status_irq(struct wacom_wac *wacom_wac, size_t len)
remote_data.remote[i].connected = connected;
}

- spin_lock_irqsave(&wacom->remote_lock, flags);
+ spin_lock_irqsave(&remote->remote_lock, flags);

- ret = kfifo_in(&wacom->remote_fifo, &remote_data, sizeof(remote_data));
+ ret = kfifo_in(&remote->remote_fifo, &remote_data, sizeof(remote_data));
if (ret != sizeof(remote_data)) {
hid_err(wacom->hdev, "Can't queue Remote status event.\n");
return 0;
}

- spin_unlock_irqrestore(&wacom->remote_lock, flags);
+ spin_unlock_irqrestore(&remote->remote_lock, flags);

wacom_schedule_work(wacom_wac, WACOM_WORKER_REMOTE);

diff --git a/drivers/hid/wacom_wac.h b/drivers/hid/wacom_wac.h
index c2c65b8..6be6cae 100644
--- a/drivers/hid/wacom_wac.h
+++ b/drivers/hid/wacom_wac.h
@@ -234,7 +234,7 @@ struct wacom_wac {
unsigned char data[WACOM_PKGLEN_MAX];
int tool[2];
int id[2];
- __u32 serial[5];
+ __u32 serial[2];
bool reporting_data;
struct wacom_features features;
struct wacom_shared *shared;
--
2.5.5